Inconsistent contributions count between requests

**Describe the bug**
I have a Github Action workflow that fetches the SVG stats from https://streak-stats.demolab.com/?user=pjmartorell&theme=transparent&mode=weekly&hide_current_streak=true&hide_longest_streak=true&border_radius=6&card_width=300
I noticed that the mentioned URL returns different results between exact same calls. See the screenshot below to see the differences.

**To Reproduce**
Steps to reproduce the behavior:

1. Open the following URL multiple times in the browser: https://streak-stats.demolab.com/?user=pjmartorell&theme=transparent&mode=weekly&hide_current_streak=true&hide_longest_streak=true&border_radius=6&card_width=300
2. Notice that when the result is not a failure, in some cases it returns a very different number of contributions

**Expected behavior**
The mentioned URL should return always the same result

**Screenshots**

**Desktop (please complete the following information):**

- OS: Mac OS Sonoma 14.4.1
- Browser: Chrome, but also fails via cURL
- Version 131.0.6778.109