In a bunch of testing with my dimmable Sengled Classic E11-G13 bulbs, I found that the displayed state on the device page for the bulb was sometimes out of sync. I reported this on another thread here, and @mike.maxwell explained why this happens with reporting on a setlevel change, and said it can be fixed. So, hopefully it's not any big reason for concern. More important is whether the bulbs themselves are turning on or off or set to a specific level as asked.
Using the Generic Zigbee Bulb device driver on Hub v704, I can ask Alexa to set the level of my Sengled Classic bulbs and it works perfectly. When viewing any of the bulbs in their Device details page, the current states are staying in sync 100%. So maybe that fix was already implemented in v704.
Are you using the Generic Zigbee Bulb device driver and Hub v704?