Macro adding horizontal line

I have this macro but when I run it, it repeats my name and adds a horizontal line.

ive seen this before in chat but I dont know what forces this horizontal line? and a repeat of the name?

/w gm &{template:degault} [[{{rname=Group Resources}} {{description= **Rango Salmoella**

Rango

HD: **@{Rango Salmoella|hit_dice}** | HP: **@{Rango Salmoella|hp}** |MaxHP @{Rango Salmoella|hp|max})  AC: **@{Rango Salmoella|ac}**

***Spells***

DC: **[[8 + @{Rango Salmoella|pb} + @{Rango Salmoella|wisdom_mod}]]** | Prepared: **[[@{Rango Salmoella|wisdom_mod} + @{Rango Salmoella|caster_level}]]**

Level 1 Slots: **@{Rango Salmoella|lvl1_slots_expended}** / @{Rango Salmoella|lvl1_slots_total}

Level 2 Slots: **@{Rango Salmoella|lvl2_slots_expended}** / @{Rango Salmoella|lvl2_slots_total}

Level 3 Slots: **@{Rango Salmoella|lvl3_slots_expended}** / @{Rango Salmoella|lvl3_slots_total}

Level 4 Slots: **@{Rango Salmoella|lvl4_slots_expended}** / @{Rango Salmoella|lvl4_slots_total}

***Resources***

@{Rango Salmoella|class_resource_name}: **@{Rango Salmoella|class_resource}** / @{Rango Salmoella|class_resource|max}

@{Rango Salmoella|other_resource_name}: **@{Rango Salmoella|other_resource}**

As DM Eddie says, you mispelled 'default', so the roll is not being put into a roll template.  Chat messages from a single player that are not in a roll template will add a line break every so often (it appears every 6 lines). You also have an extra pair of opening brackets (before the rname field), and are missing a set of closing double braces at the very end. That's just what I see at a quick glance.

Depending on what game you are playing, and which character sheet template you are using, you could likely use a different template as well, such as the 'npcaction' template for the 'D&D 5E by Roll20' character sheet template.

Assuming everything else is correct:

/w gm &{template:default} {{rname=Group Resources}} {{description= **Rango Salmoella**
Rango
HD: **@{Rango Salmoella|hit_dice}** | HP: **@{Rango Salmoella|hp}** |MaxHP @{Rango Salmoella|hp|max})  AC: **@{Rango Salmoella|ac}**
***Spells***
DC: **[[8 + @{Rango Salmoella|pb} + @{Rango Salmoella|wisdom_mod}]]** | Prepared: **[[@{Rango Salmoella|wisdom_mod} + @{Rango Salmoella|caster_level}]]**
Level 1 Slots: **@{Rango Salmoella|lvl1_slots_expended}** / @{Rango Salmoella|lvl1_slots_total}
Level 2 Slots: **@{Rango Salmoella|lvl2_slots_expended}** / @{Rango Salmoella|lvl2_slots_total}
Level 3 Slots: **@{Rango Salmoella|lvl3_slots_expended}** / @{Rango Salmoella|lvl3_slots_total}
Level 4 Slots: **@{Rango Salmoella|lvl4_slots_expended}** / @{Rango Salmoella|lvl4_slots_total}
***Resources***
@{Rango Salmoella|class_resource_name}: **@{Rango Salmoella|class_resource}** / @{Rango Salmoella|class_resource|max}
@{Rango Salmoella|other_resource_name}: **@{Rango Salmoella|other_resource}**}}

thanks!

Also, I think you're meaning to use the 5e roll template (or a specific system's template at the very least), because neither the description or rname fields are treated specially by the default template.