But only for municipal elections in some federal states. For state elections it is 18 in all federal states except for Bremen where the voting age is also 16.

But only for municipal elections in some federal states. For state elections it is 18 in all federal states except for Bremen where the voting age is also 16. However, there are students at school that are already 18, so I can see the problem here. Though it seems that it was caused by a misconfigured filter and clearly lack of intent.