1.29 + 0.05 = 1.39 ? 1.29 - 0.05 = 1.19 Issue

[ayumilove]

My Flash Develop is acting really weird,
Does this issue happens to you too?

1.29 + 0.05 = 1.39 (expected value should be 1.34)
1.29 - 0.05 = 1.19 (expected value should be 1.24)