You have to disclose transcripts from all schools attended when you apply somewhere else, so taking classes at your original community college didn’t do any harm.
Your credits from the original community college should still transfer if they are passing grades. The failing grades won’t, obviously. (Too bad you didn’t withdraw for W’s- if that had been possible. You would still lose money but your transcript would be better. Just noting for the future.)
Your GPA will start anew at UMass.
So the only problem you have here is explaining the failing grades to UMass admissions. You have proven that you can achieve really good grades by attending the second community college and doing well. That should be convincing to UMass and it looks like you are eligible for automatic transfer, once you have the credits.
I would contact admissions at UMass to discuss this, maybe in person or via Zoom. I don’t see a problem. Congratulations on doing so well for your Associate’s Degree.
You might also talk to someone at the first community college. Perhaps you can get those grades changed to W’s-? Did you have a medical or psychiatric reason for leaving? A family circumstance? Did you talk to advising? Walking away tends to result in F’s. Proper advising would have left you with W’s.
I think you will be fine regardless since you have proven you can do the work. But I would talk to both the original CC and UMass to set your mind at ease.