Whats wrong with the payroll checks??

[Avtor]

Hi everybody. I have a question to those who are experts in checks.
My story is:
I take DL and cash normal, legal original payroll check. Then I print same check, with different dates, different check # and $800 for it.
Original payoff amount was around the same amount. I print MICR with MICR toning and it reads it in store ok. I use same DL, that was used for cashing the original check couple weeks before.
In store they say its declined!!
2 different checks and times.
What could be wrong on my side??
Please help..