Dampening Pulse not working sometimes. On some creatures.

I had a Sram in play, my opponent has a Dampening Pulse. My Sram was a 3/4, as expected.
Colorless supports and creatures were played, my Sram became 4/5, 5/6, etc, as expected.
When I played a Drogskol Captain (with Defender), my Sram was moved out of first position and became a 14/14
Colorless supports and creatures were played, my Sram became 4/5, 5/6, etc, as expected.
When I played a Drogskol Captain (with Defender), my Sram was moved out of first position and became a 14/14
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