I have solved the issue by completely remove Electrum and re-install it again. For information to those who face the same fate as me (have a correct password but can't send bitcoin with that password), after uninstalled Electrum, before re-install it again, go to C:\Users\username\AppData\Roaming and delete everything Electrum. Next, restore your wallet from seed and done!

That's a process I went through and now I can send my bitcoin again. Just remember to note your seed before undergone this operation.

But I face some bug in this version that prevent me to change "Base unit" to BTC instead of mBTC. I'm on Electrum 2.7.16 with Windows 10 64 bit.

Thank you everyone for your help.