Error displaying gallery tumbs

Hi all,

after updating WordPress and this plugin, I am getting a strange error in all my galleries.

In the back, behind the thumbnails, a piece of code is displayed:

.fotorama1443608418370 .fotorama__nav--thumbs .fotorama__nav__frame{ padding:2px; height:64px} .fotorama1443608418370 .fotorama__thumb-border{ height:60px; border-width:2px; margin-top:2px}

also, there is an extra small little thumbnail projected over the other ones.

Here is a screenshot

Any idea how I can fix this?

Thanks!

https://ww.wp.xz.cn/plugins/jquery-masonry-image-gallery/