Date picker pop-up stopped working

I've built this page...

http://brandchampion.co.uk/quick-quote.php

...and the date picker has stopped working! I've tried juggling the js includes order and no joy. Any thoughts?

Still works on this page which I have copied and pasted from again, so I assume I've corrupted some code somewhere, or I have a clash of JS libraries!

http://brandchampion.co.uk/quick-quoteOLD.php

Thanks.

Aha! I just remembered that there's three JS includes at the bottom of the page code, and one of these clashes with the JS include used/created by DataAssist!

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script> created by DataAssist

<script src="js/jquery-3.2.1.min.js"></script> used by bootstrap 4

I have tried removing the earlier version created by DataAssist, but the date pop-up still doesn't activate. Obviously, taking out the later BS4 version has other ramifications!

Is this a bug that needs fixing? Have I eventually found something wrong with the beta? It's been pretty bulletproof for me up until this point!

Having just tested the page by removing the BS4 jquery-3.2.1.min.js, the page seemed to work OK and insert as expected. Even the carousel at the bottom of the page is still working. The nav works as expected still too!

So, what does bootstrap use the deleted JS file for do you think? Is it redundant and just code bloat?

You only need to include the jquery .js file once per page. You should include it on the top before any others and delete any repeated which aren't necessary and can cause things to work improperly. Usually leave the latest version when multiples exist and move it to the topmost position so it will load early enough for all of the dependent code.