Dear Xara...

Time and again I come to use an Effect for a design and I hit a fundamental error, either in the feature introduction or in its testing.

Bug - Text alignment, other than Left aligned is always problematic.
Bug - Adding a Symbol as Text, ought not to be so problematic - three adjacent Symbols produces three very large code fragments that collapse together.
Bug - Don't think of changing font, or colour.

I know is it is to do with you splitting up text lines into SPANs but when you forget to calculate from the line start, you get this hotch-potch, exacerbated by the inclusion of a Symbol but it can also be a colour change:

Xara - Text Layout FAIL.xar - press the Red STOP button!

Surely an understanding of the SPANning and use of HTML Classes around text with the addition of a SPACE at the end of a line are design decisions you ought to be aware of and therefore should be designing for and definitely testing to.

Acorn