Reproduction Steps:
1. Create new project
2. Select any float field (for example Camera's Transform position x field)
3. Select the current value (it has to be highlighted)
4. Note don't press anywhere
4. Play the scene
5. Change the same field value
6. Leave the field selected/active and stop the play
7. Press somewhere (for example, Game View) to lose focus of that field (do not focus on something else)
8. Notice that value changed back to the one before Play
9. Select the field again
10. Notice that it changes again to the value changed while Play

Expected behaviour: Values changed during play are changed back after stop
Actual result: Values are changed back, but wrong ones are displayed

Reproduced on versions: Unity 5.3.4f1, 5.3.6p4, 5.4.0p4, 5.5.0b2, 2017.2.0p1, 2018.1.0a1