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Hi my name is ***** ***** I have been in the plumbing field for 20 years. I will be glad to help you today. Is this a single handle Delta faucet?
When you turn it on it is hot and as you turn the handle it gets colder?
If that is the case and it is Delta then the issue is that the cartridge is installed upside down. Turn the house water off and remove the cartridge and turn it over and all will be well.
I haven't heard from you. Was the information I provided helpful or is there any clarification needed?
I would still like to help if you will clarify whether it is a Delta brand valve?
I will assume that you do have a Delta shower valve then since you have not replied. The cartridge is installed upside down. If you remove the cartridge and invert it then re-install it and also place the stop in the correct spot that will solve the issue.
I haven't heard from you. Was the information I provided helpful?