metronome not in sync with tempo

Hi, and welcome to this forum. How are you trying to change the tempo? Which version of SONAR do you have? The more info you give, the easier it is to help.
All the best.

The metronome will play at the tempo showing in the Tempo icon. 
Sounds like your changing the tempo and it's changing back. 
This could be either your not changing the tempo and saving it, or there's a tempo set already. 
Open the tempo map and see what it say's. 

Example: Everything says 108. And yet when I hit record, the metronome stays at 120

Or even a link to the project

 
This is the tempo map the list to the right can be edited. 

Is this with audio or MIDI material or mixed?
Changing tempi may get confusing if you copy paste MIDI clips. Every pasted clip includes a tempo definition.
If you have pasted a clip with tempo 120 at measure 10, and then change tempo at measure 8 to 100, it will switch back to 120 at the start of measure 10.
 
I'm not sure if this is the culprit in your case, but it's something you need to remember.
As suggested already, check the tempo map.
 
I can't imagine a situation with tempo window showing 108 and metronome staying at 120. Is it really 120 or just wrong/irregular? Or is it the SONAR metronome at all? In case you're talking about MIDI, do you possibly use a MIDI keyboard or workstation that can feed in a metronome of its own?
 
 

its very hard to diagnose cause you are not in front of it. sorry. I'm saying 120 cause that's what I'm guessing its at. but no matter what I change the tempo to,  the metronome stays steady at the same pace. I can put the tempo to 80 or 240 and the clicks on the metronome do not change. I realize there has been no reports of this cause I have searched everywhere. I do not howver see the tempo map anywhere. Anyway I'm going to reinstall Sonar and if that don't work, idk

Weird one. Does the audible click sync visually with the Now time cursor position in the timeline?
 
In any case, I would suggest:
 
- Test with a new project from Blank or Basic template.
- Check that Playback and Record Timing Masters are set to channels of the intended interface in Preferences (more likely to get fouled up with WDM driver mode).
- Try switching between ASIO and WDM drivers, whichever you're currently using.
 
Afterthought: Try renaming AUD.INI; SONAR will build a new one with default settings on startup.

ill just have to use session drummer as my click track

Did you delete old registry keys? This is for the latest version, but I believe that by changing name to SONAR 7 instead of Platinum you will clean up the registry for a new install.
https://www.cakewalk.com/Support/Knowledge-Base/2007013392/SONAR-2015-Clean-Install-Instructions
Hope it helps.
All the best.