Energy Graph vs Bright App Graph


I am a little confused… I used the Hidlebrand DCC graph in order to pull the usage from my Gas through to Home Assistant, what alarmed me in H/A was the amount of gas I appeared to be using throughout the night, when everything was off, suspected a leak, before I investigated further I compared this with the data from the Bright App, they are completely different?

Why??

Does everyone else match pretty close, is it just me or have I done something wrong somewhere?