I’m forced to agree. Without sufficient supporting information provided, we enter the realm of vague guesswork, at best.
My immediate guesses include;
- Broken theme configuration or file(s).
- Manjaro was installed without first checking the ISO for consistency; a damaged may result in problems that are impossible to predict, despite the OS installation completing without issue.
Please provide (at minimum) the requested system information as described (below). There you will also find a link to instructions for expected formatting and other important information, including Forum Rules.
Regards.
Note:- Topic title changed to correct spelling and enhance search results. Change it again to include the Desktop Environment that you use; please also add that DE as an optional tag.
Welcome to the Manjaro community
As a new or infrequent forum user, please take some time to familiarise yourself with Forum requirements, and the many ways to use the forum to your benefit.
To that end, links are provided (below) - Please use them.
Be prepared to provide outputs from various commands when asked. It’s equally important to provide as much actionable information as possible in your first post, rather than simply indicating there is a problem.
Waiting for others to blindly ask questions can be counter-productive – typically, nobody has a 
at their disposal – Instead, please help others to make informed suggestions, based on information you provide.
Update Announcements
The Update Announcements contain important information and a Known Issues and Solutions section that should generally be checked before posting a request for support.
System Information
While information from *-fetch type apps might be fine for someone wishing to buy your computer, for Support purposes it’s better to ask your system directly; 
Output of the inxi command (with appropriate parameters, and formatted according to forum guidelines) will generate information useful for those wishing to help:
inxi --filter --verbosity=8
or the short form (preferred):
inxi -zv8
- inxi man pages (Arch Manual)