Trade bust are automatic ? Why broker cancell my order without my request ?

Some days ago i buyed stocks with very high bid ask spread. After 2 hours my trades s cancelled and money back to me

There isnst any reason to other side cancel trade because they earn money

Brokers monitor clients accounts and do trade bust without costumer request ?

or is an automatic process from exchange ?
 
LMGTFY
https://ibkr.info/glossary/746
"A busted trade refers to a situation where an execution occurs and the broker receives the execution message from the exchange. The exchange then realizes some type of error (Pricing, electronic, obvious error, etc) and rules to bust (cancel) the trade. The exchange makes these rulings entirely on their own."
 
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