Hi Milton,
Welcome back to the PRO support forums. I’m not exactly sure what’s going on here, but I would probably start by looking at the files related to the month view to see if there is any code causing the title to display the unnecessary text. Our Themer’s Guide should provide insight on where the files you need are located. If you need any specific help, please let me know and I’ll do my best to help.
Unfortunately, we are pretty limited on theme and plugin conflicts, so if it gets beyond your level of expertise I’d check out our list of customizers for additional assistance.
Keep me updated on what you find and best of luck. Cheers!