This question has been answered by DanLoffler. See the first response.
Quote from: treigh at Sep 15, 2016, 12:59 PMIt seemed to work just fine for me => https://us01.iqwebbook.com/FVNC639/~/?coupon=LEAF&arrivalDate=Sun,%20Oct%202%202016
I didn't notice the _ga string you mentioned. This could be caused by a script or browser extension. Try thin in another browser to see.
Hi trelgh,
Maybe I didn't explain myself clearly.
The link from the ModX site is being changed. I add the link on the page, then reload the page and copy the link and it has been changed. This happens in all my browsers.