Thumbnails overlapping , How can I solve this?

Replace:

.gallery-item {
text-align: centre;
}

With:

.gallery-item {
text-align: centre;
width: 228px;
}

Are you using Chrome on a PC? On my Mac it’s fine.

Issue was solved by editing base.css:

.gallery-item { float: left; margin-right: 1px; width: 11%; text-align: center; }

TO

.gallery-item { float: left; margin-right: 6px; width: 32%; text-align: center; }

Thanks anyway guys…