Xposed-NetworkSpeedIndicator
                                
                                
                                
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                        Small triangles do not show correctly in some devices
Since the triangles are Unicode characters, they depend on the device font to support them. If the device font lacks the characters, they may show as boxes or blanks. This will be an issue with older devices with incomplete Unicode support, but newer devices should not have any problem.
Please stick to the large ones and adjust the font size (you can use decimal fractions!). Maybe a future version will use actual images instead of Unicode characters to resolve this, but that is a lot of work (structural changes to the whole app) and not in the pipeline right now.
NOTE: This issue can be expected to remain open for a long time.

i think it's problem of your custom font :(
The app does not use use any specific font. The system font is used automatically. It is a system limitation if the Unicode charset of the font does not support the symbols.
ok, i thought you have installed custom font. is it samsung sans? has samsung sans character for the triangle?
I tried all available (shows nothing unless otherwise specified):
- Default font
 - Choco cooky
 - Cool jazz
 - Rosemary
 - Samsung Sans (shows boxes)
 
None of the fonts have the small triangle characters. Anyway, device font issues cannot be solved by app developers. I can only change the way triangles are displayed - by using images, for example. But the current implementation of the app does not allow it. A full re-write will be necessary.
@wzhy90 #96 is duplicate of this