Like I wrote in my post, it is original behaviour. Maybe the server you play have the battle sense limited making the maximum values 125 and 140. If the ETPro team changed the behaviour, I suppose it would read somewhere in their change logs. I tried a quick web search with max health keywords, but I didn’t find any links with such a thing mentioned. Instead, on some forum postit was suggested that the max health can go up and over 160, which would mean the cap would have been removed. But that was just a forum post.
For the sake of the off topic discussion, it is also fun to note that helmet reduction, fall off damage and a pile of med packs have an impact. These things sometimes throw off players as a medic opponent can require even more headshots then just 4.