You can get multiple +100 EXP rewards just from connecting and disconnecting in the same map, as u can see on the console output provided below:

Connecting to 72.146.17.54:27015...
Connection accepted by 72.146.17.54:27015
* Privileges set 

BUILD 3378 SERVER (0 CRC)
Server # 1
Error: server failed to transmit file 'sound/milf_new_mod/pickup_coin.wav'
Error: server failed to transmit file 'sprite/YouTuber/640hud7x.spr'
Error: server failed to transmit file 'sprite/YouTuber/640hud36.spr'
Error: server failed to transmit file 'sprite/YouTuber/640hud61.spr'
Error: server failed to transmit file 'sprite/YouTuber/scope_paradoks_crossbow.spr'
Error: server failed to transmit file 'overviews/ze_fortressv2_pg.bmp'
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
Ti nemas mID jer koristis CS sa novim protokolom.
Server tried to send invalid command:"checkeXec
"
Unknown command: level_6_pistolsUnknown command: BufferUnknown command: anacondapistolTvoj mID je: "[NoviCS/Steam]"
mdbBans plugin verzija: v4.8
mID prefix ovog servera: 212
Ti nemas mID jer koristis CS sa novim protokolom.
You have played for 178774 seconds and now have
[MZE] [VIP REWARD] [YOU GOT 100 XP!]
Type 'amx_langmenu' in the console to display a menu where you can choose your language
Type 'amx_help' in the console to see available commands
[mdbBans] Proveravam da li ima banova koji su istekli...
[VIP LEVEL]  Earn FREEVIP , reach /LEVEL 50
Connecting to 72.146.17.54:27015...
Connection accepted by 72.146.17.54:27015
* Privileges set 

BUILD 3378 SERVER (0 CRC)
Server # 1
Error: server failed to transmit file 'sound/milf_new_mod/pickup_coin.wav'
Error: server failed to transmit file 'sprite/YouTuber/640hud7x.spr'
Error: server failed to transmit file 'sprite/YouTuber/640hud36.spr'
Error: server failed to transmit file 'sprite/YouTuber/640hud61.spr'
Error: server failed to transmit file 'sprite/YouTuber/scope_paradoks_crossbow.spr'
Error: server failed to transmit file 'overviews/ze_fortressv2_pg.bmp'
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
Missing RIFF/WAVE chunks
[VIP]  You have got 2 HE, Smoke Grenades & 3 Jumps .
Server tried to send invalid command:"checkeXec
"
Ti nemas mID jer koristis CS sa novim protokolom.
Tvoj mID je: "[NoviCS/Steam]"
mdbBans plugin verzija: v4.8
mID prefix ovog servera: 212
Unknown command: level_6_pistolsUnknown command: BufferUnknown command: anacondapistolDavid dropped
You have played for 178848 seconds and now have

David connected
David is joining the Counter-Terrorist force"mp_c4timer" changed to "10"
[MZE] [VIP REWARD] [YOU GOT 100 XP!]
Type 'amx_langmenu' in the console to display a menu where you can choose your language
Type 'amx_help' in the console to see available commands
[MILF] MILF Level-System] +100 XP.

This is fixed, thanks for reporting this.