Hi there,
There are a few reasons why your Domain Authority may still be the same, despite more backlinks being built to your website:
- Moz may not have discovered all of the new backlinks to your website yet, so they may not have been factored into the DA score
- If they have discovered them, then there is a chance that some backlinks may not improve your DA score quickly and it may take more links in order for your DA to go up. This is particularly true the higher your DA is because the algorithm that DA uses is logarithmic which means that the higher you go, the harder it becomes to increase it
- The DA of other websites may have changed and could be skewing the DA of the websites that are now linking to you
You can read a bit more information and watch the videos here for more information on DA
I'd also just mention that you should remember that whilst DA/PA are designed to give some direction on how well you can rank in Google, they are not connected to the Google algorithm, so definitely keep an eye on DA, but don't forget about other metrics too.
I hope that helps!