mfirefox

I have found the problem. The buttons had somehow slipped under the content

Yes, there are:

[Error] ReferenceError: Can’t find variable: bds_autocomplete
(anonyme Funktion) (Anonymes Skript 1 (Zeile 3))
i (jquery.js:2:27368)
add (jquery.js:2:27658)
(anonyme Funktion) (jquery.js:2:29727)
(anonyme Funktion) (jquery.js:2:25095)
(anonyme Funktion) (jquery-migrate.min.js:2:3143)
n (jquery.js:2:420)
Bewertungscode (Anonymes Skript 1 (Zeile 2))
eval
(anonyme Funktion) (jquery.js:2:2673)
globalEval (jquery.js:2:2680)
Ga (jquery.js:3:21143)
append (jquery.js:3:22653)
success (register.min.js:1:3122)
i (jquery.js:2:27368)
fireWith (jquery.js:2:28123)
x (jquery.js:4:22587)
c (jquery.js:4:26778)

Yes, it works everywhere else but not on the register page…