PS: Invoke-WebRequest - Second call is Encoded - powershell

Question

When calling a URL using
$source = Invoke-WebRequest -Uri $URL
The first request works fine, but in the same session calling a different page from the same domain I get what looks like an encoded source.
Here is a small example
Working URL Call (First Call)
RawContent : HTTP/1.1 200 OK
Content-Language: en-US
X-Frame-Options: SAMEORIGIN
Transfer-Encoding: chunked
Connection: keep-alive,Transfer-Encoding
Cache-Control: no-store, no-cache
Content-Type: text/html;... Forms : {, filter->form} Headers : {[Content-Language, en-US],
[X-Frame-Options, SAMEORIGIN], [Transfer-Encoding, chunked],
[Connection, keep-alive,Transfer-Encoding]...} Images :
{#{innerHTML=; innerText=; outerHTML=aa846a08e9b3/idm-instruments-pty-ltd-hallam-3803-logo.jpg">;
outerText=; tagName=IMG; title=IDM
Instruments Pty Ltd - logo; class=listing-logo enhanced->logo; alt=IDM Instruments Pty Ltd - logo;
Non Working Call (Second URL Call)
RawContent : HTTP/1.1 200 OK
Content-Language: en-US
X-Frame-Options: SAMEORIGIN
Connection: keep-alive
Content-Length: 14201
Cache-Control: max-age=86400, public
Content-Type: text/html;charset=utf-8
Date:... Forms : {captcha} Headers : >{[Content-Language, en-US], [X-Frame-Options, SAMEORIGIN],
[Connection, keep-alive], [Content-Length, 14201]...} Images
: {#{innerHTML=; innerText=; outerHTML=
alt="Yellow Pages"
src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIwAAACMCAYAAACuwEE+AAAAG
>
XRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAFa5JREFUeNrsXQl4FMXWrYQlLLIJAgYE>BAFZZAeRIKs8FgU1GkBQCPIEcQH9hfwqAoryFEVx+9gVAYOCCgq4REXBCIYlbD4gQESW4BKRhE2IIel
>
3T0/N2Pv0TCaTnpk633cI011d3VV1+9atW7eqo1hkIYZYk/MKYjViJeJl/G8UsaLmmvNEiXiWeI7/zS>H+QczmzIuUCowK47LVIHYhdiReR2xNbFBM9zpC3E38kbiNuJl4kgk4GpWJ8cSFxAyuFUqSGfxZ4vmzC
>
TgAscSHiRuJ+Q4QEjPm82d8mD+zQBBRgZhIXE8sdLCQmLGQP3siL4tAMaEFcQ4xNwSFxIy5vEwtRPMG>Dr2Jn4aRkJjxU15WAT/Rh5gWAYKiZRovu4BNdCZuiEBB0XIDrwsBE9QhJgtB0TGZ140AR2niRIVHVVD
Any Help would be great.