Compression test, what does it mean???

[deportes]

1983 380 SL, ONLY cyl 8 fouls plugs and smokes after startup, idling at red light or any other idle posibility.

Removed all spark plugs and all other than cyl 8 look great, no dark deposits, if anything maybe running lean or hot.

decided to test the compression on all cylinders dry and this are the results.

1= 168
2= 178
3= 175
4= 170
5= 175
6= 174
7= 163
8= 200

I tested number 8 last and retested them all. How is that the bad one tested higher?
Is it that oil is leaking into the cylinder somehow and it test as if it was a wt test.
What do do next. Any ideas?

Thanks