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I am just learning to bid.If it was an overbid they should have refunded me back.I send the same amount-200ST to smartsteem.They very decently immediately refunded me saying they are full.Both-Smartsteem & Booster-had Refund Policy,but then why booster dint refund me if it was an overbid? Was it a mistake from their software?

Nah, that's not software mistake. Actually some bots has roi cap. when you cross the minus(-), it refunds. But booster has no cap on minus(-) neither on plus(+). So it won't refund even if you send 1000000 steem/sbd

Ok Thanks for the Guidance.I'll be careful nexttime.