Problem With Power Supply.?
To calculate inrush, assume everything is discharged and the AC line is connected at its peak.  You say your input is 230 VAC.  That's assumed to be a sine, so the peak is 325 V.

The elements limiting the inrush current are R2 and C1, which are in series.  Instantaneously, the 325 V is all applied across R2.  How fast that decays depends on C1.  Since the value for C1 is messed up in your schematic (all I see is "105"&lt;something&gt;) we can't help with that and you're on your own.

Even if the instantaneous energy dumped into R1 is low enough, the voltage may not be.  R1 must not only be rated for the short term energy handling (different from sustained power rating), but also the voltage.

A obvious thing to do would be to change R1 to a 2 W resistor, and of course make sure it's rated for 350 V at least, then see what happens.

In general when dealing with line power, you should derate significantly since the cost of failure can be quite high.