WP-34s, bug, or my mistake

[smtschmidt]

I use the emulator with Build 9.1.2016, Version 3872 and my calculator with Version 3783.
When I enter the following keystrokes:

0 FILL
12 ENTER
65 *
ENTER (>> x = 780, y = 780)
,19 * (>> x = 148,2, y = 0!)

I get only 0,19*12*65=148,2 and the second result 12*65=780 disappears

But when I try

0 FILL
12 ENTER
65 *
ENTER (>> x = 780, y = 780)
SHOW
EXIT
,19 * (>> x = 148,2, y = 780)

it works as aspected.
Is it a bug or my fault?