PWM1 & PWM3 synchrounization problem!!

Dear all,
Good day!!
I am setting COMPR1 and COMPR2 to produce two variable-duty cycle PWM
signals. although both signals are having the same period etc. (off course
with different compare values). However, unfortunetly, what I am having on
the Oscelliscope is that one signal is travelling with respect to other
one.
on the other hand, if i use the same table (compare values) for both
COMPR1 and COMPR2 then both signals will be in sync. (tied to each
other).
hence, I can't really understand what makes one of them travelling with
respect to the other since both of them are using the same timer1 and same
period ,,, etc.
any comments/ suggestions would be greatly appreciated

kindes regards
MSAD

.

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