Solved

Didn't receive engines.

I had 58 tokens and ran out of engines so I purchased 10 engines with 10 tokens however my tokens went but i didn't receive any engines.

same here, bought 10 engines before last race, shows 0 engines at the moment

true :D sry

With all due respect, i can assure you that i bought engines. I remembered that when i used to play the game a few moths back, a short cut was for me to just click replace engine when i didn't have any left and then i could just purchase it. I did that and then it happened.
If I am wrong, feel free to correct me.