Understanding ovulation! Help!!

My ovulation days always change! I usually start my period a day or so before glow says I will and therefore by ovulation days will change after I correct my period days. My SO is in the air force so we can't try as often as we like. Does anyone else know why it tells me I'm ovulating before day 14 my cycle is typically 28-29 days long! Any and all answers are needed!
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