Timing doesn't match note count

OK ... this is extremely frustrating. First 6 measures at 4/4 count, notes add up (ie, 1/4
s, 1/8s, etc). 7th measure, notes do not add up. In fact, with the metronome sounding on the 7th measure, there is a quick jump to the first beat in the 8th measure. Ie, 1 and 2 and 3 and 4 1 and 2 and 3 and 4. There is no "and" between the 4th beat of the 7th measure and the 1st beat of the 8th measure. Using 1, a, +, b, 2, a, +, b, 3, a, +, b, 4, a, +, b to identify each 1/16th beat (each number, letter and plus sign gets 1/16 beat (comma just a separator) thereby adding up to 16), the following timing is: 1(1/8 dot note = 3/16), a(nil note), +(nil note), b(1/16 note), 2(1/8 note), a(nil note), +(1/8 note), b(nil note), 3( 1/8 dot note = 3/16), a(nil note), +(nil note), b(1/16 note), 4(1/16 note?) and then the next measure! It is suppose to be 4(1/8 note), a(nil note), +(1/8 note), b(nil note). THere are no rests. I tried moving the 4/4 timing to each measure, but no change. What am I doing wrong. Simple math!?!