Admin look weird after update

Hello,

I updated nextgen and now I have this: https://i.imgur.com/7abvWY3.png

I did the following:
– deactivated the plugin: now the look is normal, so the mistake is at Nextgen
– deactivated my own theme and activate nextgen, now the look is normal

so there is a mismatch with my own theme and the plugin, does somebody have an idea where to look? As I am out of solutions ??

this is my website

https://www.ads-software.com/plugins/nextgen-gallery/