At the far right side of your timeline, there is "skip frames" and that is active. That will cause the play to jump to the keyframes rather than showing all of them.

---

Available on Amazon for the Kindle E-Reader Monster of the North and The Shimmering Mage

Today I break my own personal record for the number of days for being alive.
Check out my store here or my free stuff here
I use Poser 13 and win 10