Command Block Delay Extension

In many of my worlds, I gave been experiencing lag. The lag is so bad that commands with a ticking delay are delayed for longer than the set delay. This could just be a connection problem but I'm not entirely sure.

Steps to Reproduce:
-Note: As of filling this out, I am the only person that I know of that is affected by this.
1. Set up a command block with a ticking delay
-The longer the set delay, the more noticable it should be.
2. Run the command

Expected Result:
I had used many command blocks but one with a set ticking delay had a delay of 20 ticks.

Observed Result:
That command block ran after more than 20 ticks.
-I couldn't get an exact number mainly because the delay was not extended the same amount each time.