I have two maples in my backyard, one is an autumn flame maple, one an autumn blaze maple. Both are acting strangely this year.

Autumn flame maple: This tree has been in this location for 6 years--roughly 4" diameter at chest height, and overall probably 16+ feet tall. It has had some years of good growth (1'+ per season). This year, it is showing almost no growth. I see only two brances that have about 8" of growth, but the rest seems unchanged. In addition, I have never seen this tree produce as many seeds as it has this year. It set the seeds over a month ago, and they remain on the tree. Otherwise, the tree looks normal. Is something wrong?

Autumn Blaze Maple: This tree has been in this location for 3-4 years. We purchased it potted, and at the time, it was 4" diameter at chest height. It was obvious that the growers hacked the branches to 'shape' (ugh) it before selling. It is about 15' tall. This tree leafs out each year, and grows maybe a few inches, but definitely not the growth rate that I read about with autumn blaze maples. I realize that it takes a couple of seasons for a tree to 'take hold' and live up to its potential. However, I am wondering if 3-4 seasons is normal? I'll also mention I don't see much of a change in caliper yet, and no flaring at the trunk base yet. Otherwise, it looks normal.

Can anyone lend any insight?