You have a javascript error that is stopping the lightbox function you have in your script file from being executed.
script.min.js:formatted:3656 Uncaught TypeError: Cannot read property 'outerWidth' of undefined
at n.fn.init._calcItemPositions (script.min.js:formatted:3656)
at n.fn.init._placeItems (script.min.js:formatted:3766)
at n.fn.init._handleFiltering (script.min.js:formatted:3754)
at n.fn.init.filter (script.min.js:formatted:3478)
at Object.init (script.min.js:formatted:3470)
at n.fn.init.e.fn.filterizr (script.min.js:formatted:3409)
at o.<anonymous> (script.min.js:formatted:4261)
at o.e.emitEvent (script.min.js:formatted:3129)
at o.complete (script.min.js:formatted:3268)
at o.check (script.min.js:formatted:3252)
at o.<anonymous> (script.min.js:formatted:3175)
Starting on line 3656 in Chrome's Dev Tools ( F12 or CRTL+Shift+i or right click on page and select Inspect) window when the script.min.js is formatted (unminimized).
If I take your little bit of lightbox script from your post and execute it in Chrome's Dev Tools Console, I can then click on the EyE icon for a lightbox window. It does take an initial second click though per icon, that could be related to the JS error not sure about it though.
Thank you @Saj!
Yes, it works only with a 2nd click... This [violation] also appears in the table - https://www.chromestatus.com/feature/5745543795965952
Definitely I messed up with a jquerry - I've put the line form my 1st post line into js of the filterable gallery from this BootsrapStudio item ( http://imagia-mu.com/DEV/BS/filterable-gallery ) and... messed it all ;)