CrowdFunding Landing Page With HTML and SASS

Ok, of all the project i had done in frontend mentor this is probably the hardest. Not in terms of the design but the javascript, i might say i am not too experience with javascript there are little things i can nail and others i cannot. For this project i could not update the numbers after a amount was donated or move the progress bar forward when the donation was made. The javascript is messy and lastly when i was working on the project the input section seemed to work perfectly fine but for some reason unknown to me it just stopped working. I mean you can look at the code and see it. it was working perfectly fine one minute, the next minute it was not. it was so annoying and frustrating. if anyone can point out the issue, it would be well appreciated and if anyone can suggest to me on how i can, improve my javascript that also would be appreciated thank you. Please look at the code and tell me what i did wrong and give feedback please thank you.