I used to join servers with 38 to 45ms (filtered<50ms) and once in match it always increased to 52ms (always 52ms).
Since few days ago the number of servers <50ms has decreased drastically and once joined ping increases to 92 or 96ms.
Same issue with several spanish people with different inet services.
ps: not needed to comment this game ping dependence and the difference of playing 40 vs 90ms.
thx.