you have to mine the wood log again after being mined

Hello Mojang there is a bug on mc pc edition. the bug is confirmed on macbook. after the wood log is mined then the wood log reappers and you always have to mine it again. Understand what i mean? after you mined the wood log the wood log reappears and you always have to mine it again. fix it please in 1.8.8 1.9 or something.