just found the problem.
It’s a conflict with the Maintenance & Coming Soon Redirect Animation plugin.
In console I receive this error
[DOM] Found 2 elements with non-unique id #mep_event_reg_btn_nonce:
<input type=”hidden” id=”mep_event_reg_btn_nonce” name=”mep_event_reg_btn_nonce” value=”9f6f85cf8a”> <input type=”hidden” id=”mep_event_reg_btn_nonce” name=”mep_event_reg_btn_nonce” value=”9f6f85cf8a”>
Somebody can help me please…
