Is glow wrong?

Question

It says I am 3weeks 5days but the math doesn’t seem to add up and first response website said I should be 4weeks 1 day. 
My last period was 1/13/18

Answer

If you've been logging your periods and your cycle is longer than 28 days, it readjusts your predicted ovulation dates and might push you back a few days for that reason. For example if your period tends to come every 32 days, the calculation estimates you ovulate a couple days later than a woman with a 28 or 30 day cycle.

Answer

my LMP 1/14 I'm 4 weeks today exactly, now doctors lil circle dial they use says I'm 1 day ahead I'm reg 28 day. cycle.

Answer

My lmp was 1-11-18 and I’m 4 weeks 3 days - was figured out by my doc. They have a wheel they use to figure that out and it doesn’t take into account your cycle length . So according to my docs tool you’re 2 days behind me so 4 weeks 1 day

Is glow wrong?

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