Two new issues:
I’m able to do both in Microsoft Word, so it isn’t a problem with my computer.
Here’s the version I’m using:
Version: 25.8.1.1 (X86_64)
Build ID: 54047653041915e595ad4e45cccea684809c77b5
CPU threads: 8; OS: Windows 11 X86_64 (build 26100); UI render: Skia/Raster; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: threaded
Can you enable View - Formatting marks (Ctrl+F10), put the cursor in the offending paragraph, take a screenshot showing the ruler and the paragraph, edit your question and share the screenshot* there?
If you can share a reduced sample document (one paragraph showing the issue), will be better to diagnose the problem. Thanks.
* Something like 
I have a similar problem:
As (I hope) you can see the “A” doesn’t line up with the tab mark. Here is the version information:
25.2.7.2 for Windows 11. I downloaded the latest version (25.8.4.2) in the hope that that might fix it, but no luck.
Attach a sample file for a more technical look.
Are both first line and before text indent marks aligned at 0 of the horizontal ruler? 
Is the paragraph left aligned?
Where is the after text indent mark? 
Are there more tabs (the blue arrows) to the left or to the right of your paragraph?
There is at least one more tab stop to the right of your paragraph: see that there is no more automatic tab stops to the right of the left tab stop at 4.6 cm.
One possible scenario:
Indent & Spacing and Tabs in menu Format - Paragraph.