I have a question about Shoddy Battle

[DDnite]

Well I was using my blissey and kept softboiling but the HP recovered was gradually falling. I want to ask whether this is a glitch or if I have done something in battle that caused it.
Here is th battle log:

Blissey used Softboiled.
Blissey restored 50% of its health.
Empoleon used Surf.
Blissey lost 18% of its health.
The sandstorm rages.
Blissey is buffetted by the sandstorm!
Blissey lost 6% of its health.
Empoleon's leftovers restored its health a little!
Empoleon restored 6% of its health.

Blissey used Softboiled.
Blissey restored 36% of its health.
Empoleon used Surf.
Blissey lost 19% of its health.
The sandstorm rages.
Blissey is buffetted by the sandstorm!
Blissey lost 6% of its health.
Empoleon's leftovers restored its health a little!
Empoleon restored 6% of its health.

Blissey used Softboiled.
Blissey restored 25% of its health.
Empoleon used Surf.
Blissey lost 19% of its health.
The sandstorm rages.
Blissey is buffetted by the sandstorm!
Blissey lost 6% of its health.
Empoleon's leftovers restored its health a little!
Empoleon restored 6% of its health.

If anyone knows the answer please help

edit:
I guess I was careless. Thanks jumpluff

 

[jumpluff]

If you were over 50%, it can only Softboiled up to 100%.