Binauraliser produces some low-level artefacts

[a-zhendi]

Hello!
I've noticed the plugin is not 100% accurate at very low levels and produces some strange artefacts.

Below is a comparison of the waveforms:

1. The original IR (el=0 and az=0) from the source code (the "saf_default_hrirs.c" file - "This default HRIR set is a Genelec Aural ID of a KEMAR Dummy Head (@48khz)").
2. The same IR after the binauraliser plugin (rendered as a dirac-spike through the plugin). Plugin config is: el=0, az=0, with the default HRIR set, no Diffuse-Field EQ.

Reaper setup, running in 48000 Hz, no resampling during processing:

The original IR waveform, 256 samples length:

The IR after the binauraliser, 256 samples length, looks the same as above:

However, when we zoom-in vertically some strange things appear.

The original IR waveform, vertical-zoom-in, 256 samples length:

The IR after the binauraliser, vertical-zoom-in, 256 samples length:

As we can see waveforms are not the same...
Let's zoom-out horizontally...

The IR after the binauraliser, vertical-zoom-in, horizontal-zoom-out, > 256 samples length:

The white color highlights 256 samples.
There are some copies of the IR before and after...

Also here is a comparison of the frequency responses of the IRs.

Frequency responses, as-is:

Frequency responses, separated:

Is it a bug?
Or is it some expected behaviour of the plugin's processing?