Its very hard to explain but i think you may be able to fix this..

inside the cluster.. the number wheels run on a thin metal shaft.. The end of the shaft goes into this plastic piece to hold the wheels straight. Over time the shaft can pull out of place and "fall" for lack of better words....

I know that the Trip odometer does somehow affect the odometer itself.. i dont remember specifics.

TIP: Do not pull the shaft out, just try and replace the shaft into place. If you pull the shaft out, not only will you have to put the numbers back, but you will have to line them up and put the propper metal clips back in between the numbers,, for some this could be confusing.. and do not touch the number on the wheels. . If i remember correctly the numbers rub off or fade very easily...maybe they did this for odometer fraud,, not sure

Be prepared to do this again.. for some reason, once it happens, it continues to happen again..