Overiding other plugin scripts

Hey there folks,

I installed this plugin and when I activated and placed my js files where they needed to be it worked and I love it. But for some reason, since doing so, my other plugin (modern calendar) doesn’t work properly. The date selection on add event won’t load, I cannot go between months or switch views (monthly/weekly/daily). This are js file controlled (if my logic is correct) so it seems that when I have activated nthe new (this) plugin on my site it overrides the js on Mordern Calendar. Is there a way to stop this happening? I thought that this app adds extra js function to my site rather than override ones already in use.

Sorry if that makes no sense.

Many thanks for any suggestions and help.