In Small Washington there are similar glyphs:
...
Rb1-101 Rb1-102 Rb1-103 Rb1-104 Rb1-105

Rb1-105 presumably corresponds not only to Qa8-33--36, but also to Qa8-37. Perhaps Rb1-107 also belongs to these 'parallel' glyphs of Q.

Qa8-31 Qa8-32 Qa8-33 Qa8-34 Qa8-35 Qa8-36
...

Several glyphs at the end of Ra8 are missing and then nearly half of those in Rb1. None are missing at the end of Rb1 - the three dots mark that one or two glyphs are  missing at the beginning of Rb2.

Rb1-106 Rb1-107 Rb1-108 Rb1-109

Qa8-37 has a form of hua which possibly might be explained by Rb1-106. Cfr the corresponding glyph Qb3-101 which has the standard form of hua:

 

On the other hand Qa8-35 is also a possible explanation.

Qa8-37