I’ve gained 1kg in a week but the only thing I’ve changed is increasing my steps

I weigh myself daily and my weight has consistently increased this week to the point that l've gained a kilo within a week (doesn't seem like a fluctuation).
Like stated in the caption, the only thing that's changed is increasing my steps (5k to 8k) but everything else has stayed consistent.

I’ve attached my 2025 weight log incase it’s of any use lol

Please help😩