As manddy123 mentioned the % is relative to the amount of physical tam you have.
that said, if you assumed you had 8GB and say for example a 4gb stick went dead on you (ram or motherboard socket) then you would see your ram seemingly jumping in such a fashion.
1. check if you have the total physical amount of ram you expect to have installed in your computer
2. Windows 10 does this the easy way, in the search box, type " show how much ram" and you should see something like this; (in windows 7 open a explorer windows, click at top bar on computer then "system properties")
does this match the amount of ram you "know" you should have ?
Note: looking at your 98% image you showing us you...