That 2x yesterday was it really a 4x?

So yesterday I was training my Battle Mage at the lvl 120 monkeys I was getting about 11k per kill and I felt that something was off so I dropped by today and I was getting 2910 per kill so like did Nexon mess up and give us 4x or did I maybe have a 2k coupon that I didn't know about? Hmm...

Well It was 2x for me. Got about 70% at level 150 from killing BGA, BGB and boss. Total exp according to Hidden street 18.4M.
Mult by 2 * 1.1 since mercedes * 18.4 / 58.4M = 70% so checks out.

Nexon did extend the time limits of all Cash Items by 4 hours after yesterday's maintenance, so I assume the x2 EXP card you got on Tuesday was extended to still be useable and stack with the event x2 EXP on Wednesday.