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Here's what is going on. Some presets use the default values, and some do
not. This is not about which game a preset is for; it is about which
preset you are using for a game. Default values are stored in a settings
file, and when a log uses the default values, it does not store them in
the log. All it stores are the variables whose values differ from their
default values. So, when you change the set in the URL for a log that uses
the default set, it does not overwrite this with anything in the log,
because the log does not contain any value for the set. But when the log
does not use the default set, it overwrites the value given in the URL
with the value stored in the log.

In the two Chess URLs you gave, you included your userid in the one that
showed Alfaerie pieces. It showed Alfaerie pieces, because you customized
your viewing preferences, and it was using the set you had chosen to use.
This value is stored in the log and will overwrite anything in the URL.
The other URL did not include your userid. So it used the set given in the
log. Since the Chess presets are based on one that uses Alfaerie pieces on
a B&W marble board, and you were using a preset with Abstract pieces on a
table board, the log for this game changes some of the defaults. These
overwrite the values set in the URL.