Kegleopstillingen er forkert.

Because Danish, like German, very often makes compound nouns by joining words together.

kegleopstillingen =

• kegle = pin / skittle / cone
• opstilling = arrangement / setup
• -en = the

So the whole word means the pin setup / the arrangement of pins.

Writing it as separate words would normally be wrong in standard Danish.

The ending -en is the definite article attached to the noun. In English, you use a separate word: the. In Danish, it is often added to the end of the noun.

• en kegleopstilling = a pin setup
• kegleopstillingen = the pin setup

So Danish often says the-setup as one word instead of using a separate the.

In Danish compounds, the first noun is often in its singular form, even if English might naturally think in plural terms.

So:

• kegleopstilling = literally something like pin-setup
• not usually kegleropstilling

This is very common in Danish compounds. English learners often expect a plural first element, but Danish usually prefers the singular in this kind of structure.

Kegle can mean different things depending on context, such as:

• cone
• skittle
• pin

In this sentence, it most likely refers to pins/skittles, not a traffic cone. So kegleopstillingen is the setup or arrangement of the pins.

Er is the present tense of at være = to be.

So:

• er = is / are / am, depending on context

In this sentence:

• Kegleopstillingen er forkert = The pin setup is wrong

It is the normal Danish verb used for identity, description, and condition, just like to be in English.

Here forkert is used predicatively, meaning it comes after er and describes the subject.

With adjectives in Danish:

• singular often uses the basic form
• plural and definite descriptive uses often take -e

Examples:

• En opstilling er forkert. = A setup is wrong.
• Opstillingerne er forkerte. = The setups are wrong.
• Den forkerte opstilling = the wrong setup

So in Kegleopstillingen er forkert, forkert is the correct form.

Also, this adjective is a little tricky because its basic form already ends in -t, so the form does not change the way some other adjectives do.

Yes, very similar here.

The structure is:

• Kegleopstillingen = subject
• er = verb
• forkert = subject complement / description

So it works like:

• The pin setup
  • is
    • wrong

This is one of those Danish sentences that maps quite neatly onto English word order.

You usually invert the subject and verb:

• Er kegleopstillingen forkert? = Is the pin setup wrong?

That is a very common Danish pattern:

• statement: X er Y
• question: Er X Y?

You add ikke after the verb in a simple sentence like this:

• Kegleopstillingen er ikke forkert.

So:

• er = is
• ikke = not
• forkert = wrong

This word order is very typical in Danish main clauses.

Yes, that would also be grammatical and natural.

Compare:

• Kegleopstillingen er forkert.
  More compact; uses a compound noun.

• Opstillingen af keglerne er forkert.
  More analytical; literally The arrangement of the pins is wrong.

Danish often prefers compounds, so kegleopstillingen sounds very natural.

A rough learner-friendly breakdown is:

• kegle ≈ KAY-gluh
• opstillingen ≈ OP-stil-ling-en

Put together:

• KAY-gluh-op-stil-ling-en

A few useful notes:

• the g in kegle is not a hard English g as in go
• the final -en is a very common Danish definite ending
• compounds are usually pronounced as one unit, not as fully separate words

In Danish, nouns are not capitalized the way they are in German.

So:

• kegleopstillingen
• forkert

Only the first word of the sentence is capitalized here because it starts the sentence:

• Kegleopstillingen er forkert.

If the word appeared in the middle of a sentence, it would normally be lowercase.